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Allen was introduced in "S.S.D.D.", helping Sergeant Foley train Afghan National Army troops at Firebase Phoenix in Afghanistan. He demonstrated to the troops how to aim, fire a weapon, throw a grenade to take down targets. He then underwent a selection phase for Task Force 141, running "The Pit", prior to engaging local OpFor troops immediately afterwards.

After completing "The Pit", he is hand-picked by General Shepherd to go undercover in Vladimir Makarov's personal cell under the alias Alexei Borodin. During the events of "No Russian", Allen is selected to participate in Makarov's assault on Zakhaev International Airport where the Inner Circle perpetrates a massacre of the civilians present and of the responding FSB forces. Allen is eventually killed by Makarov when attempting to escape from the airport, who had learned about his real identity ahead of time. His body was then left behind for FSB forces to find, implicating the United States as the perpetrators of the attack and thus igniting World War III. He became a victim of a conflict of goals between General Shepherd and Makarov.

The name Alexei Borodin might be a reference to the first Call of Duty game, because of the fact that the first playable Russian character's first name is Alexei, and the first person the player meets has the last name "Borodin".

Allen only speaks during the cutscene of Cliffhanger. In-game he is completely silent.

The tattoos on Allen's chest that were added as part of the operation are Russian Prison tattoos. The cathedral is symbolic of how long a person has been in prison, with each steeple representing a sentence.

The coordinates that appear in his watch always show the same coordinates that direct to Drexel, Missouri.